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Patented Dec. I7, 190i. H. A. KLEMM.

THREAD CONTROLLING MECHANISM FOR SEWING MACHINES.

(Applimtion Med Dec. 13, 1900.)

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7 No. 689,200. Patentad Dec. l7, 190i.

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THREAD CONTROLLING IECHANISI FOR SEWING MACHINES.

(Am am Due. 13. 1900.1

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ATTORNEY I UNITED STATES HERMANN A. KLEMM, on NEW YORK, NJY.

THREAD-CONTROLLING MECHANISM FOR SEWING-MACHINES:

PATENT ()FFICE.

SPECIFICATION forming part of Letters Patent No. 689,200, dated December 17, 1901. Application filed December 13,1966. Serial No. 39,686. (No model- My invention consists of improvements inglove-sewing machines in which a verticallyoperating needle is used,together with a loopthread-carrying hook and a loop-spreading stud in forming chain -stitches under the work; and it consists of improvements of the hook-thread grips for holding the threads against the pull of the take-up devices when drawing up the loops of the hook-thread, as

hereinafter described, reference being made to the accompanying drawings, in which Figure 1 is partly a side elevation and partly a sectional elevation of my improved glovesewing machine. Fig. 2 is a horizontal section on line 2 2 of Fig.1. Fig. 3 is a detail of the machine in side elevation as seen from-the rear side of Fig. 1 and a transverse section of the main shaft, showing the cam and lever for operating the hook-thread gripper. Fig. 4 is a horizontal section of the stationary supporting-arm at its base and a plan view of the gripping devices for holding the hookthread while the take-up for said thread is in operation. Fig. 5 is a section of, the hookthread-gripper shaft and an elevation of the gripper, the section being taken on line 0 0,

Fig. 4. Fig. 6 is a detail of the devices for' effecting the loop-spreading movements of the hook. Fig. 7 is asection of the needle-thread grip on line 1 1, Fig. 1. Fig. 8 is a part of the head of the stationary arm in side elevation.

For a better understanding of the parts to be claimed I have represented the machine generally in the drawings, and herein briefly describe the same, to begin with, as follows:

A represents the base of the machine; a, the work-plate b, the stationary supportingarm for the needle and prcsser-bars and the needle-bar-operating lover a, and thehead of said arm in which the needle-bar d and the presser-bar e are mounted.

f is the shaft for operating the various parts;

g, the pulley for applying the power to said shaft; h, the needle-bar-operatiug lever, and

MM connecting-rod actuated by an eccentric on the shaft and pivoted to lever h atj for operating said lever, which is pivoted to the supporting-arm b at lcfor itsfulcrum and I is connected to the needle-bar by the link Z and collar m.

n represents the needle, and o the presserfoot. The presserbar has the usual camdog 19 for liftingand holding the presser-foot up, also the usual spring (not shown) for causing the pressure of the foot on the work.

The loop-thread-carrying hook is represented at g. It is a suitably-curved finger mounted on the upper end of a staff 5, pivoted directly under the needle, so as to swing forward and backward along the needle below the work-plate and preferably in the plane of the feed movement, and it also has lateral movement for spreading the loops of its thread. The hook-threadt enters the eye at u in the heel of the hook and passes along the groove 1) in the side of the hook and through the eye to near the point. The stalf s of the hook is mounted in a socket w, in which it is adjustable vertically relatively to the needle n, with a set-screw y to secure it in position. The socket a: is mounted on a rocking pivot 2, carried in the forked head 3 of a rock-shaft 4 for effecting the lateral movements of the hook relatively to the needle.

The socket a: is adjustable around the rocking pivot 2 for gaging the hook relatively to the needle and is provided with a set-screw 5 for fixing it in position. The rocking pivot 2 has a lateral arm 6, which is coupled by a ball-and-socket joint 7 with a connecting-rod Y 8 of an eccentric 9 on the shaftffor swinging the hook to carrythe hook-thread loops through the loops of the needle-thread. The arm 6 is adjustable in the rocking pivot 2 to vary the range of the movement of the hook and has a set-screw 10 for fixing it in position.

The rock-shaft 4, in the head of which the hook-staif is mounted for being laterally shifted, is operated by a grooved cam 11 on the shaft f, in which a stud 12 works, that is carried on an arm 13 of said shaft 4.

The needle-thread 15 is led off from a spool on the pin 16, (behind spool 20,) through the tension-disks 17 and the gripper 18 on the extremity of lever h, and around the .guidestud 19 on the needle-bar near its upper end,

lip-that is, stud 1'9--on the needle-bar is drawing up the needle-thread, and thus prevent drawing the thread from the spool and insuring the proper take-up. 38 is a camplate on the side of the stationary arm 0, against which the inner end of pin 35 comes in contact when the needle-operating lever h rises to release the gripper when the thread is to be drawn from the spool; but I do not claim herein the particular contrivance of the needle-thread gripper.

The hook-thread t is drawn from spool 20, also on pin 16, through tension-disks 21 and through the eyes 22 of the take-up yoke 23 to the hook q, and the lever h carries a takenp arm 24, which swings between the members of the yoke when the needle descends and the hook retires and takes up the slack of the hook-thread. A gripper is also provided to prevent drawing the hook thread from thespool while taking up the loops of said thread. It consists of the anvil 39, located between the friction-disks 21 and the eyes 22, and a finger coacting therewith, so as to grip and hold thethread between them while arm 24 is taking up the thread. The finger is carried on one extremity of a shaft 41, having a hearing in the stationary arm b at its base, and on its other end having a lever 42, with which a cam 43 on shaft f acts to eifect'the grip of the thread at the proper timethat is, while the loop is being taken up by arm 24.

The finger 40 and lever 42 are slightly ilexi ble for efiecting elastic grip.

The release of the grip may be efliected by the g'ravitating action of lever 42 or a spring movement is effected by an eccentric 31 on said shaft, the rod of which, 32, is coupled at 33 (dotted in Fig. 1) with an arm of the leyer-support 28, so as to impart the reciprocating movements to the feedplate. The spring 34 depresses the feed-plate preparatory to next operation; but the feed mechanism is not claimed in this application.

What I claim as my invention is- I The combination with the needle loopinghook, and the take-up for the hook-thread, said take-up consisting of the pair of guideeyes for the hook-thread located at the rear extremity of the frame of the machine, and the arm carried by the rear end of the needlebar-operating lever, of the hook-thread gripper consisting of the anvil located at the en trance for the thread into said guide-eyes,

the gripping-finger adapted'to coactwith the anvil, rock-shaft carrying said finger, and mounted in the base of the stationarysupporting-arm parallel with the main shaft, cam on said main shaft, and a lever on said rock.-

shaft coacting with the cam for effecting the grip, and means for releasing the grip.

Signed at New York city this 1st day of December, 1900. g

HERMANN A. KLEMM. WVit-nesses:

. C. SEDGWICK,

A. P. THAYER. 

